/*
 * FreeRTOS V202212.00
 * Copyright (C) 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy of
 * this software and associated documentation files (the "Software"), to deal in
 * the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
 * the Software, and to permit persons to whom the Software is furnished to do so,
 * subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
 * FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
 * COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
 * IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 * https://www.FreeRTOS.org
 * https://github.com/FreeRTOS
 *
 */

/******************************************************************************
 * This project provides two demo applications.  A low power project that
 * demonstrates the FreeRTOS tickless mode, and a more comprehensive test and
 * demo application.  The configCREATE_LOW_POWER_DEMO setting (defined at the
 * top of FreeRTOSConfig.h) is used to select between the two.  The low power
 * demo is implemented and described in main_low_power.c.  The more
 * comprehensive test and demo application is implemented and described in
 * main_full.c.
 *
 * This file implements the code that is not demo specific, including the
 * hardware setup and FreeRTOS hook functions.
 */

/* Kernel includes. */
#include "FreeRTOS.h"
#include "task.h"

/* ST library functions. */
#include "stm32l1xx.h"
#include "discover_board.h"

/*-----------------------------------------------------------*/

/*
 * Set up the hardware ready to run this demo.
 */
static void prvSetupHardware( void );

/*
 * main_low_power() is used when configCREATE_LOW_POWER_DEMO is set to 1.
 * main_full() is used when configCREATE_LOW_POWER_DEMO is set to 0.
 * configCREATE_LOW_POWER_DEMO is defined at the top of main.c.
 */
extern void main_low_power( void );
extern void main_full( void );

/* Prototypes for the standard FreeRTOS callback/hook functions implemented
 * within this file. */
void vApplicationMallocFailedHook( void );
void vApplicationIdleHook( void );
void vApplicationStackOverflowHook( TaskHandle_t pxTask,
                                    char * pcTaskName );
void vApplicationTickHook( void );

/*-----------------------------------------------------------*/

int main( void )
{
    /* Prepare the hardware to run this demo. */
    prvSetupHardware();

    /* The configCREATE_LOW_POWER_DEMO setting is described at the top of
     * this file. */
    #if configCREATE_LOW_POWER_DEMO == 1
    {
        main_low_power();
    }
    #else
    {
        main_full();
    }
    #endif

    /* This line will never be reached. */
    return 0;
}
/*-----------------------------------------------------------*/

static void prvSetupHardware( void )
{
/* GPIO, EXTI and NVIC Init structure declaration */
    GPIO_InitTypeDef GPIO_InitStructure;
    EXTI_InitTypeDef EXTI_InitStructure;
    NVIC_InitTypeDef NVIC_InitStructure;

    void SystemCoreClockUpdate( void );

    /* System function that updates the SystemCoreClock variable. */
    SystemCoreClockUpdate();

    /* Essential on STM32 Cortex-M devices. */
    NVIC_PriorityGroupConfig( NVIC_PriorityGroup_4 );

    /* Systick is fed from HCLK/8. */
    SysTick_CLKSourceConfig( SysTick_CLKSource_HCLK_Div8 );

    /* Set MSI clock range to ~4.194MHz. */
    RCC_MSIRangeConfig( RCC_MSIRange_6 );

    /* Enable the GPIOs clocks. */
    RCC_AHBPeriphClockCmd( RCC_AHBPeriph_GPIOA | RCC_AHBPeriph_GPIOB | RCC_AHBPeriph_GPIOC | RCC_AHBPeriph_GPIOD | RCC_AHBPeriph_GPIOE | RCC_AHBPeriph_GPIOH, ENABLE );

    /* Enable comparator clocks. */
    RCC_APB1PeriphClockCmd( RCC_APB1Periph_COMP, ENABLE );

    /* Enable SYSCFG clocks. */
    RCC_APB2PeriphClockCmd( RCC_APB2Periph_SYSCFG, ENABLE );

    /* Set internal voltage regulator to 1.5V. */
    PWR_VoltageScalingConfig( PWR_VoltageScaling_Range2 );

    /* Wait Until the Voltage Regulator is ready. */
    while( PWR_GetFlagStatus( PWR_FLAG_VOS ) != RESET )
    {
    }

    /* Configure User Button pin as input */
    GPIO_InitStructure.GPIO_Pin = USERBUTTON_GPIO_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_IN;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_40MHz;
    GPIO_Init( USERBUTTON_GPIO_PORT, &GPIO_InitStructure );

    /* Select User Button pin as input source for EXTI Line */
    SYSCFG_EXTILineConfig( EXTI_PortSourceGPIOA, EXTI_PinSource0 );

    /* Configure EXT1 Line 0 in interrupt mode triggered on Rising edge */
    EXTI_InitStructure.EXTI_Line = EXTI_Line0; /* PA0 for User button AND IDD_WakeUP */
    EXTI_InitStructure.EXTI_Mode = EXTI_Mode_Interrupt;
    EXTI_InitStructure.EXTI_Trigger = EXTI_Trigger_Rising;
    EXTI_InitStructure.EXTI_LineCmd = ENABLE;
    EXTI_Init( &EXTI_InitStructure );

    /* Enable and set EXTI0 Interrupt to the lowest priority */
    NVIC_InitStructure.NVIC_IRQChannel = EXTI0_IRQn;
    NVIC_InitStructure.NVIC_IRQChannelPreemptionPriority = configLIBRARY_LOWEST_INTERRUPT_PRIORITY;
    NVIC_InitStructure.NVIC_IRQChannelSubPriority = 0;
    NVIC_InitStructure.NVIC_IRQChannelCmd = ENABLE;
    NVIC_Init( &NVIC_InitStructure );

    /* Configure the LED_pin as output push-pull for LD3 & LD4 usage */
    GPIO_InitStructure.GPIO_Pin = LD_GREEN_GPIO_PIN | LD_BLUE_GPIO_PIN;
    GPIO_InitStructure.GPIO_Mode = GPIO_Mode_OUT;
    GPIO_InitStructure.GPIO_OType = GPIO_OType_PP;
    GPIO_InitStructure.GPIO_PuPd = GPIO_PuPd_NOPULL;
    GPIO_InitStructure.GPIO_Speed = GPIO_Speed_2MHz;
    GPIO_Init( LD_GPIO_PORT, &GPIO_InitStructure );

    /* Force a low level on LEDs */
    GPIO_LOW( LD_GPIO_PORT, LD_GREEN_GPIO_PIN );
    GPIO_LOW( LD_GPIO_PORT, LD_BLUE_GPIO_PIN );
}
/*-----------------------------------------------------------*/

void vApplicationMallocFailedHook( void )
{
    /* vApplicationMallocFailedHook() will only be called if
     * configUSE_MALLOC_FAILED_HOOK is set to 1 in FreeRTOSConfig.h.  It is a hook
     * function that will get called if a call to pvPortMalloc() fails.
     * pvPortMalloc() is called internally by the kernel whenever a task, queue,
     * timer or semaphore is created.  It is also called by various parts of the
     * demo application.  If heap_1.c or heap_2.c are used, then the size of the
     * heap available to pvPortMalloc() is defined by configTOTAL_HEAP_SIZE in
     * FreeRTOSConfig.h, and the xPortGetFreeHeapSize() API function can be used
     * to query the size of free heap space that remains (although it does not
     * provide information on how the remaining heap might be fragmented). */
    taskDISABLE_INTERRUPTS();

    for( ; ; )
    {
    }
}
/*-----------------------------------------------------------*/

void vApplicationIdleHook( void )
{
    /* vApplicationIdleHook() will only be called if configUSE_IDLE_HOOK is set
     * to 1 in FreeRTOSConfig.h.  It will be called on each iteration of the idle
     * task.  It is essential that code added to this hook function never attempts
     * to block in any way (for example, call xQueueReceive() with a block time
     * specified, or call vTaskDelay()).  If the application makes use of the
     * vTaskDelete() API function (as this demo application does) then it is also
     * important that vApplicationIdleHook() is permitted to return to its calling
     * function, because it is the responsibility of the idle task to clean up
     * memory allocated by the kernel to any task that has since been deleted. */
}
/*-----------------------------------------------------------*/

void vApplicationStackOverflowHook( TaskHandle_t pxTask,
                                    char * pcTaskName )
{
    ( void ) pcTaskName;
    ( void ) pxTask;

    /* Run time stack overflow checking is performed if
     * configCHECK_FOR_STACK_OVERFLOW is defined to 1 or 2.  This hook
     * function is called if a stack overflow is detected. */
    taskDISABLE_INTERRUPTS();

    for( ; ; )
    {
    }
}
/*-----------------------------------------------------------*/

void vApplicationTickHook( void )
{
    /* This function will be called by each tick interrupt if
    * configUSE_TICK_HOOK is set to 1 in FreeRTOSConfig.h.  User code can be
    * added here, but the tick hook is called from an interrupt context, so
    * code must not attempt to block, and only the interrupt safe FreeRTOS API
    * functions can be used (those that end in FromISR()). */
}
/*-----------------------------------------------------------*/

void vAssertCalled( unsigned long ulLine,
                    const char * const pcFileName )
{
    volatile unsigned long ulSetToNonZeroInDebuggerToContinue = 0;

    /* Parameters are not used. */
    ( void ) ulLine;
    ( void ) pcFileName;

    taskENTER_CRITICAL();
    {
        while( ulSetToNonZeroInDebuggerToContinue == 0 )
        {
            /* Use the debugger to set ulSetToNonZeroInDebuggerToContinue to a
             * non zero value to step out of this function to the point that raised
             * this assert(). */
            __asm volatile ( "NOP" );
            __asm volatile ( "NOP" );
        }
    }
    taskEXIT_CRITICAL();
}
